print('{0}'.format(1))
str = 'aaaa'
print(f'这个程序{str}')
for i in range(1,10):
    for j in range(1,i+1):
        print(f'{i}x{j}={i * j}\t',end=" ")
    print()
for i in range(0,101,2):
    print("----开始下载----")
    if i==100:
        print("下载完成")
        break
    else:
        print(f'{i}%[',"*"*(i//2),"."*(50-i//2),']')

sep = ','
print(sep.join(str))
print(str.upper())
print("good".center(20,'*'))

word = 'n'
str1 = 'personality'
result = str1.find(word)
print(result)